“The cleats can only be worn during Week 13 of the season. Their vibrant patterns are a huge departure from the usual guidelines for game time cleats. Typically, all of the players on a team must wear shoes with the same dominant colors. Things like brand names and logos generally aren’t allowed, and when players break the rules, they get fined $6076 for the first infraction and $12,154 for subsequent ones.

The league and players worked on the campaign for 18 months, and several of the players’ stories were featured on The Players’ Tribune website.

After the games are finished, the cleats are being auctioned off, with proceeds benefiting each respective charity.

Since the Cowboys beat the Minnesota Vikings on Thursday, some of their cleats are already available for auction online.

It’ll cost one lucky winner at least $3,515 for a pair worn by rookie running back Ezekiel Elliott in the team’s week 13 win. Elliott’s cleats, recognizing the SPCA of Texas, had the highest bid in the auction’s first few hours.

Jason Witten’s custom cleats were demanding at least $1,800 as of Monday morning. The bid for Sean Lee’s cleats had climbed over $1,200.

Cleats worn by Brandon Carr, who was one of three players who honored his foundation, Carr Cares, had eclipsed the $1,000 mark by Monday morning.